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    <script>
        //         ### 练习题6:

        // **目标：** 编写一个函数，接受一个数组作为参数，并返回数组中所有偶数的和
        let a = [1, 2, 3, 7, 8, 9, 4, 5, 6]

        function getSum(arr) {
            let sum = 0
            for (let i = 0; i < arr.length; i++) {
                if (arr[i] % 2 === 0) {
                    sum = sum + arr[i]
                }
            }
            return sum
        }
        console.log(getSum(a));
    </script>
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